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Don't break down when it's cold outside.

Cerium is the most abundant rare earth metal, decomposes slowly in cold water and rapidly in hot water. The Arc'teryx Mens' Cerium LT Hooded Down Jacket is not quite as prevalent as its namesake, but does slow your decomposition in cold weather. The combination of 850-fill European goose down and strategically placed Coreloft insulation keeps you warm whether you wear the Cerium alone or under a hardshell when you're confronted with a winter tempest most storm chasers avoid.
Bigger numbers are fun when it comes to betting odds and down insulation. A higher fill-power down, like the 850-fill used in the Cerium, refers to how much space a single ounce of down occupies. The more space taken up by the down means more air is trapped between the fibers. Trapped air creates a barrier between warm air from your body and cold air in the environment, so you stay warm when it's cold outside. Taking this logic one step further, if one ounce of a certain down takes up more space than a different type of down, it stands to reason you'll need less of the 'bigger' down to keep you warm, thus reducing the weight of your jacket. In essence, this jacket's high down fill makes it both light and warm.
Since down doesn't maintain its warmth when it gets wet, the folks at Arc'teryx placed synthetic insulation in the spots that are most likely to get a bit damp. Still, while Coreloft insulation does resist moisture better than down, and an ominous drizzle won't leave you a cold, soaking mess, it's best to pair this with a waterproof shell if you know the weather is coming.
This superlight hooded jacket comes with its own stuff sack so you can easily bring it along and so your pack stays organized. The same 850-fill down fills the low-profile StormHood so your melon stays warm. (Mom was right—if you keep your head covered, you'll stay warmer.) Two zippered hand pockets hold your keys and phone, trail map and candy, or your partner's ID and lip balm.

  • Lightweight Airetica shell, 10x20D ripstop nylon
  • DWR treated
  • 850-fill European goose down in core and hood
  • Coreloft synthetic insulation, 80 and 100 g/m2
  • Trim fit, hip length
  • Low-profile StormHood
  • 9.7 ounces (M)
  • Includes stuff sack

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Arc'teryx Cerium LT Hooded Down Jacket - Men's

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Unanswered Question

What is the best size for me - I've heard the Cerium LT is a trim fit. This would be worn as a base layer. I'm 5'8", 140lbs, 37-38" chest with 31" waist and hips. I have an Arcteryx Alpha SV size small which has plenty of room for layering up under it but as I understand it the Cerium LT is a whole other fit altogether. Thanks

I'm 5'10 and my current weight is 180 I want to layer up under this jacket for NYC winters what's your best recommendation for a comfortable fit medium or large?

Since it has a trim fit I would get the large to make it comfortable. You could probably fit into a medium but, it might be snug especially when you layer underneath it. What is your chest measurement? That is a really good indicator of how the jacket will fit.

If you have anymore questions feel free to send me an email or call!

Bill Porreca

Michael -
Just tried on the Medium and the Large at the store. I'm basically the same dimensions as you and the Large fit perfectly over an undershirt and a regular fit button up shirt. The medium was form fitting, but a bit tight in the sleeves.

I also tried on the Thorium AR Down which is a more of a regular fit/square cut and the Medium version of that was more roomy than the Large in the Cerium.

2 5

design error

  • Familiarity: I returned this product before using it
  • Fit: True to size
  • Height: 5' 10"
    Weight: 190 lbs
    Size Purchased: XL

I find it hard to believe there is not a draw cord at the waist. Deal killer.

Mike, the Cerium LT Hoody is designed as a super light weight down insulator. Hence the elasticized bottom hem, super light face fabric and minimal features. If you're looking for draw cords at the waist, check out the Thorium AR Hoody.

Thoughtful design, not an error.

Are these made in China? I just got one on ebay for a deal and it says "Made in China." However, a search of the web shows that apparently a lot of Arcteryx goods are made in China. I just want to confirm as I'm returning the ebay purchase and planning to re-buy the jacket here, assuming it's not made in China. (And assuming the size is right. Everything I read about these jackets said they run small so I bought a large, but it's huge on me.)

Best Answer

It is made in China, but that doesn't mean anything. As I know this jacket definitely has counterfeit in color nighthawk and black. I suggest you to purchase from authenticated sellers.

5 5

Can't wait for winter-I live in Orlando

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Height: 5' 9"
    Weight: 145 lbs
    Size Purchased: small

I love the feel and fit of this jacket. I have the small (5'9", 145lbs). Fit is great. It fits perfectly under my theta AR medium shell. It feels like I am walking around in a super comfy sleeping bag. I only got to wear it once since owning it. It was warm but only in the lower 60's with a lot of wind. I can't wait to ski out west next winter!!

The small would be tight with a thick (heavy sweater) under layer. Should be no problem with a heavy long underwear layer though. My 200 wt fleece likely would be too much and would need to go over the jacket. I doubt this Florida boy will see weather requiring long undies, 200wt fleece, Cerium LT and Theta shell. Cerium and Theta should be an awesome combo.

I love the Backcountry exclusive color too. My wife is very jealous!!

5 5


  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Weight: 130 lbs
    Size Purchased: S

I really like this jacket, it fits me well and keeps me warm in the winter

3 5


  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Height: 6' 2"
    Weight: 200 lbs
    Size Purchased: Large

I was looking for a light-quality down and didn't mind sacrificing features but this jacket sacrificed the wrong ones. The fabric and build quality are top-notch and the weight is acceptable but the jacket lacks a waist hem cord and backing for the zipper. That means that the jacket is totally dependent on a shell in any sort of wind. This is really disappointing and basically means that lighter jackets like the Ghost Whisperer and the Patagonia ultralight feel much warmer in all but the most tranquil of conditions. Look else-where for a jacket that can stand alone.

The size L was also very short on my torso compared to other size L jackets I've tried.

No waist hem adjustment is the worst idea in the history of down coats. Get the Montbell Frost Smoke.

If Montbell would get water resistant down there would be no reason to buy another 3.0-4.0 ounce fill weight jacket.

5 5

I like this jacket.

  • Familiarity: I've put it through the wringer
  • Fit: True to size

The hooded down is good for artic conditions.

5 5

Love this jacket

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

First impressions:

Love the fit! Pretty much echoing what many other's have said-fits like a glove. You won't look like a marshmallow which is always a good thing. My North Face down jacket makes me look huge (unfortunately not muscular huge), while this one looks nice and trim. The color is great. That is one thing I love about Arc'teryx-the colors are amazing. One thing though-I got it in Nighthawk, and I thought the accents were a nice orange. They are more of a red. It doesn't bother me, but just for future purchasers.

I have worn it in a variety of temperatures. All the way from on my trip to Chicago when it was single digits to slightly warmer days here in Virginia, when we've been in the 20s and 30s. Can't complain at all. Did a superb job keeping me from freezing in Chicago, and hasn't had me overheating in the warmer temperatures.

I haven't had the issues with it losing down like others have. Not to say it won't, but so far so good.

Random note-I love the hood. Not only does it look cool, it is also incredibly easy to adjust.

Hello, I'm torn between getting this jacket and L.L. Bean's Ultralight 850 Down Hooded Jacket. Does anyone have experience with both so that they can compare them together?

Best Answer

Haven't tried this hoodie, but I can tell you that the Bean hoodie is a little gappy in the middle, and the hood - although very good - isn't adjustable. Also - when last I checked, it wasn't available until JUNE!

I just received my LL Bean Ultralight and love it (was told it was back ordered to June 1). Very light, has Pertex shell, inside skins pocket and zip pocket that the whole jacket packs into and 3 outside zippered pockets. Got it on sale for about $170. I am 6'1, 195 and fit nicely in a Medium Tall. Nice fit. We'll see how it holds up but has a lot of features for the $.

4 5

LT = super light

  • Familiarity: I returned this product before using it
  • Fit: True to size

This is a very light jacket, around 9 oz. I was looking for a winter camping/wearing around town coat and this was much too thin. Unfortunately, it replicated what I already owned (a Wild Things PrimaLoft sweater about the same as the Patagonia down sweater). I returned it and went with the Cerium SV, which perfectly fulfilled the requirements I needed in a jacket.

Which is warmer, Cerium LT or Western Mountaineering Flash XR? Also, which is smaller when compressed?
I will be wearing one of these under a softshell jacket during multi-day alpine climbing in winter Alps.

The WM Flash XR will be warmer it has more down in it. The Cerium LT will compress more due to less down. Either or will be fine, Id say under a soft shell you are just fine with the Cerium LT.

I'll ask what's gonna be warmer n last longer this or the Patagonia down sweater

Patagonia Down sweater will be warmer and last longer but, it is not as performance oriented as the Cerium LT. The Cerium LT is meant for light, fast moving through the mountains where the Down Sweater has more of an all around purpose.

5 5

I am in love with this jacket

  • Familiarity: I've used it several times
  • Fit: True to size

Simply put, it is light as a feather, it is cut to fit your body (narrow and tall), is is warm as hell. You will not notice wearing the Cerium LT except for the fact that you won't be shivering, and when your friends try to punch you in the gut, you won't feel a thing from that 850 fill softening the blow! Yet still you won't look like the michelin man. Yes, miracles do happen.

Just go out and buy this jacket. Yes it is spendy but trust me, you will look good, you'll feel good about wearing it, and this baby doesn't compromise on performance. Rather, it excels.

2 5

Loss of Feathers

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I really wanted to love this jacket. As others have said, I have too many feathers coming through the face fabric and seams. Every time I put the jacket on I can see a little white feather poking out somewhere on it. So sad. I will be returning this product. On the plus side, this jacket is so light. Feels like you are not wearing it. Great for summiting with or even around town during the winter. Does not make you look like a mitchilin man.

5 5

Great jacket so far

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small

I've only had this jacket for a weekend but I wanted to throw a quick review up with some photos for anyone else out there.

First off the fit is fantastic. It fits like a glove and yet also allows for an incredible range of motion with your arms. I would have no problem climbing with this jacket. The hood fits well as well and had great coverage.

Second off, this jacket is incredibly warm for how light it is. You hold it in your hands and you think it's going to float away even though it's got quite a lot of down in it. The jacket was extremely warm with just a t-shirt on underneath in 40-45 degree weather on Antelope Island.

The zippers all feel great on the front, and pockets also.

All in all this has been a great jacket so far. I can't wait to go on more adventures with it.

Great jacket so far
4 5

Warm for weight; not sure about syn bits

  • Familiarity: I've put it through the wringer
  • Fit: True to size

Great cut, very cozy hood, one of the subjectively warmest down pieces in its weight class. Dinged it a star for leaking a lot of feathers relative to the Pata UL Down Hoody. A tad nervous to see how the synthetic bits hold up over repeated stuffing cycles.

2 5

Lost its loft :(

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I loved this jacket the first winter I had it. But after a year the down is nowhere near as lofty as it was when I first wore it. Some of the ribs are completely flat now. It's lost a lot of its warmth as a result.

Has anybody else experienced this? Any trick for reviving it? I'm pretty bummed about it.

You should buy some down soap from REI. Run it tgrogyctge washer and dry with tennis balls or similar to fluff it up.

Had this happen to a North Face Crimptastic Hybrid jacket I loved last year (past tense because the Cerium LT replaced it and has had no durability issues). Body oils and compression (happened in the back middle) caused it and it happens to any down product that gets used a lot, is compressed long periods, or accumulates dirt/oil.

For nearly all of my down gear including jackets and sleeping bags, professional cleaning brought loft back when it had not been damaged. Taking it to a shop that cleans down and/or contacting the manufacturer to have them clean it has been the best soluition for my gear. In one case, a sleeping bag was cleaned by the manufacturer for shipping costs only as a warranty issue. Just a suggestion, you may want to check Arc's limited lifetime warranty; they have been really good to me on warranty claims.

5 5

Gift for my hubby

  • Familiarity: I gave it as a gift but have feedback to share
  • Fit: Runs large

I got this jacket for my husband because i love it. And now he does too. He wears his rain shell over the jacket and its a perfect winter jacket. Really really warm. He is 5'9" and 150lbs and wears a size medium. The jacket is a little baggy but that just seems to be the the fit of the coat. The stuff sack is also a definite plus when it gets too hot while hiking to attach to the backpack. Plus its a good looking coat!

Gift for my hubby

What is the center back length of a medium?